Described herein are embodiments of systems and methods for oxidizing gases. In some embodiments, a reaction chamber is configured to receive a fuel gas and maintain the gas at a temperature within the reaction chamber that is above an autoignition temperature of the gas. The reaction chamber may also be configured to maintain a reaction temperature within the reaction chamber below a flameout temperature. In some embodiments, heat and product gases from the oxidation process can be used, for example, to drive a turbine, reciprocating engine, and injected back into the reaction chamber.

A thermally driven power generator having a base and a heat source placed within the base. The thermally driven power generator further having a heat collector is adapted to collect the heat from the heat source through a plurality of fins and a heat sink adapted to release heat into the environment. The thermally driven power generator further having a thermal electric power generation module is sandwiched between the heat collector and a heat sink; the thermal electric power generation module is designed to convert heat collected by the heat collector to electrical power. A tray assembly for a thermally driven power generator, the tray assembly having: a transport tray; and a magnetic element integrated with the transport tray, the magnetic element designed to attract a wick keeper of a candle such that the wick is held in place.

A fire tube boiler includes a perforated flame holder configured to hold a combustion reaction that produces very low oxides of nitrogen (NOx).